What is NACL or Network access control list?
It is an optional layer of security for your VPC that acts as a firewall for controlling traffic in and out of one or more subnets.
So we need to understand clearly that NACL is the optional layer, which works for controlling the traffic with the Subnet.
And security group works at the instance level not the subnet level.
And there are a few rules and basic concepts that we need to understand before we can use NACL properly:
1. The default VPC automatically comes with a modifiable default network ACL. and By default, it allows all inbound and outbound IPv4 traffic.
2. You can create a custom network ACL and associate it with a subnet. With the default one that you have, if you don't want to use it or if you want to use a specific target measure, then you can create your own NACL and attach your subnets to it.
VPC Sessions :
▶ PART 1: What is a VIRTUAL PRIVATE CLOUD? Amazon VPC | Visual Explanations :
https://youtu.be/nmhXCqxKe-M
▶ PART 2: WHAT IS A CIDR IN AWS? | VPC PART 2 | Visual Explanations
https://youtu.be/N-BppnZ8AoQ
▶ PART 3: WHAT IS A VPC SUBNET AND HOW TO ASSIGN SUBNETS IN VPC? VPC PART 3 | Visual Explanations
https://youtu.be/onALWhdukHE
▶ PART4: AWS SAVINGS PLAN | COMPUTE AND EC2 INSTANCE SAVINGS PLANS | Visual Explanations
https://youtu.be/cqA423WNHo8
▶ PART5: HOW TO CREATE VPC and SUBNET | HANDS-ON DEMO
https://youtu.be/pUQjavImhSc
▶ PART6: WHAT IS INTERNET GATEWAY? WHAT ARE ROUTE TABLES? WHAT IS PUBLIC SUBNET? | Visual Explanations
https://youtu.be/CAbumERzqqQ
▶ PART7: HOW TO PROVIDE INTERNET ACCESS TO INSTANCES AT VPC PRIVATE SUBNET? | NAT GATEWAY | NAT INSTANCE
https://youtu.be/mtvlEsgn_C4
▶ PART8: HOW TO CREATE NAT GATEWAY? | HAND ON DEMO
https://youtu.be/_JumK1gOYW8
▶ PART9: HOW TO CREATE NAT INSTANCE? | HAND ON DEMO
https://youtu.be/iZQfPF2nJDE
▶ PART10: VPC DHCP Options Set | AWS Private Hosted Zones | Visual Explanations
https://youtu.be/TEkP_l0zMtw
▶ PART11: AWS NACL and Security Groups | Ephemeral Ports | Visual Explanations
https://youtu.be/p0XCg5VhKQA
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